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(No Model.)

H. G. ISAAOS.

COMBINATION FIRE PROOF ARCH.

No. 303,856. Patented Aug. 1Q, 1884.

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HENRY G. ISAACS, OF'ST. LOUIS, MISSOURI.

COMBINATION FIRE-PROOF ARCH.

SPECIFICATION forming part of Letters Patent No. 303,856, dated August 19, 1884.

' Application filed March 17, 1884. (No model.)

To @ZZ whom t may concern:

Be .it known that I, HENRY G. Isaacs, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented an Improvement in FreProof Arches, of which the following is a specification.

My invention relates to an arch, presenting a ilat under side having voussoirs made either ofterra-cotta, concrete, porous brick, or any other composite material, the voussoirs being formed with dat horizontal bottoms.

The object of my invention is to produce a strong and substantial arch of about the thickness ofthe length of a brick.

In order that my invention may be .readily understood, I will proceed to describe it with reference to the accompanying drawings, in which- Figure l is a vertical transverse section of my arch on the line H I, Fig. 3. Fig. 2 is a vertical longitudinal section on the line A B, Fig. l, showing hollenr voussoirs. Fig. 3 is an under view of the arch, the ceiling being omitted.

A may represent I-beams, to the base of which are secured abutments Gr, having slant sides g and dovetailed recesses g on the un der side.

The 'arch proper consists of voussoirs C, formed, preferably, hollow, as shown in Fig. 2, with slant sides c, flat horizontal under sides, c', and dat tops c. Dovctailed recesses c are formed in the flat under sides.

E are bricks or blocks placed on the voussoirs, and F the bonds or keys placed between the latter. Above this arch is placed the filling D, which receives the stringers H and floor I.

B is the ceiling, secured to the under side ol' the arch and abutments by occupying the dovetailed recesses. Thus it will be seen I obtain an arch level. at bottom and a level ceiling. The shape ofthe voussoirs forms a curved line on the upper surface. By this construetionI obtain the greatest necessary strength with the minimum amount of material, and of about one-half lthe thickness of the ordinary arches for supporting iloors, and by the bonds or keys the voussoirs and brickwork are madeV independent and reciprocating as to strength and form.

I claim as my invention- 1. In an arch, the combination, with suita ble beams, of abutment-s G, voussoirs G, having fiat horizontal under sides, keys F, and blocks E on the voussoirs between the keys, as set forth.

2. In an arch, the combination of beams A, abutments G, voussoirs C, having ilat bottoms, keys F between the voussoirs, blocks E above the voussoirs .between the keys, filling D, stringers H, loor I, and the ceiling secured to the abutments and voussoirs.

HENRY G. ISAACS.

'Vitnesses:

A. I). HYATT, THos. C. REYNOLDS. 

